Vaisala

Humidity is hard to measure well, and Vaisala has specialized in it since 1936. The Finnish company makes probes and transmitters for relative humidity, dew point, temperature, pressure and carbon dioxide in industrial processes. Seven Star LLC lists the Vaisala Indigo520 transmitter, HMP7 probe, HMT330 transmitter and DMT152 dew point transmitter, and sources Vaisala instruments for process plants in Oman and the GCC.

Vaisala product families

The Indigo line separates probe and transmitter. The Indigo520 takes two Indigo-compatible probes at once and offers four analog outputs, relays and Ethernet in a metal IP66 enclosure, with or without a touchscreen. The HMP7 humidity and temperature probe is one of the probes that connect to it. The HMT330 is the earlier one-piece humidity and temperature transmitter series, and the DMT152 is a compact transmitter for low dew points in dry gases.

Ordering Vaisala instruments: what we need

Vaisala builds each unit to an order code. Send the full code, or the probe type, cable length, output signals, supply voltage, display option and the certificate type required. For dew point, give the expected range and line pressure.